Display unit for door station of door intercommunication system, has control element to mark participant or participant group of selection list such that highlighted entry in list is highlighted with respect to other participants

摘要

The display unit has display portion on which subscriber list is displayed. The control elements are provided to mark participant or participant group of participant selection list. The highlighted entry in the list is highlighted with respect to other participants in an enlarged image display portion. The change of the highlighted participants to next selected participants of the next participant highlighted is displayed at the same fixed point on the display.